The 1991 Prize was awarded to Professor Paul Crutzen of the Max Planck Institute of Chemistry in Mainz, Germany, one of the world's leading research scientists in the field of atmospheric chemistry. Professor Crutzen has achieved this eminence by undertaking a series of major research projects over a period of more than 20 years, including studies of ozone layer depletion and the greenhouse effect. He was awarded te Nobel Prize in Chemistry in 1995.

The Prize Jury's Citation:
Professor Crutzen was awarded the Prize for an outstanding ability to identity and elucidate critical features governing the chemical behaviour of the atmosphere. He has shown great ability to excel in a wide scope of interrelated researh activities in topics relevant to atmospheric science.